Two-Part Silicone Rubber Molds (Forming a Straight Parting Line)

When mass casting a part without a flat side, you must create a two-part mold. We create a two-part silicone rubber mold with a clean parting line and then cast the part with Repro.
00:00 - Introduction to Silicone Moldmaking with Parting Lines
02:48 - Mold Registration & Gating
03:38 - Pouring Elkem V-340 Silicone Rubber
04:09 - Demolding First Half of Mold
05:04 - Preparing Second Half of Mold
06:04 - Demolding Second Half of Mold
07:14 - Pouring Liquid Urethane into Mold
08:22 - Demolding Fast-Cast Urethane Part
This is an updated version of the video originally entitled Two-Part Silicone Rubber Molds (with a straight parting line). We’ve gone back to increase the resolution, correct the color; plus update the graphics and add some clarifying content.
Freeman Mfg & Supply is a materials supplier. The thousands of hours dedicated to producing this series was done in service to our industry. If you are looking for any of the materials shown, please visit us at freemansupply.com (our primary website for professionals) or miapoxy.com (curated for the DIY market).
Finally, this video was originally part of a compilation DVD entitled Making Parts, Patterns, Tools, & Molds. You can see all of those videos (in sequence and in context) on our dedicated video website at www.FreemanVideos.com. Or check out our KZbin Playlists. Or find your next video of interest here:
Moldmaking & Casting Videos:
1 - Using Rigid Fast-Cast Urethanes for Casting Both Molds & Parts
• Using Rigid Fast-Cast ...
2 - Making Flexible Molds with Urethane Rubber
• Making Flexible Molds ...
3 - Simple Silicone Rubber Molds (Without a Parting Line)
• Simple Silicone Rubber...
4 - Two-Part Silicone Rubber Molds (Forming a Straight Parting Line)
• Two-Part Silicone Rubb...
5 - Moldmaking With Clear Silicone Rubber
• Moldmaking With Clear ...
6 - Making Molds & Casting Thin Walled Parts (& Using Color Tints)
• Making Molds & Casting...
7 - Making Two-Part Silicone Rubber Molds with Complex Parting Lines
tinyurl.com/spf9z8hs
8 - Tips & Tricks for Moldmaking & Casting Parts with Intricate Detail
• Tips & Tricks for Mold...
9 - Making Simple Multi-Cavity Molds
• Making Simple Multi-Ca...
10 - Surface Casting Method #1 (featuring Gap Wax)
• Surface Casting Method...
11 - Surface Casting Method #2 (With Brushable Urethane Casting Resin)
• Surface Casting Method...
12 - Using Fillers & Pourable Foam to Lighten a Casting (& More)
tinyurl.com/2cav5em5
Laminate Toolmaking & Composite Parts Videos:
1 - Laminating with Fiberglass & Epoxy - The Basics
• Laminating with Fiberg...
2 - Building a Fiberglass & Epoxy Laminate Mold
• Building a Fiberglass ...
3 - Vacuum Bagging a Carbon Fiber/Composite Part
tinyurl.com/auf6d2d8
4 - Building a Laminate Tool with Epoxy Paste
• Building a Laminate To...
5 - Rapid Tool Making with the Repro Laminating System
• Rapid Tool Making with...
6 - Making a Simple Glove Mold
• Making a Simple Glove ...
Preparing Models, Molds, & Materials Videos:
1 - Prevent Your Castings & Models From Sticking to Your Molds
• Prevent Your Castings ...
2 - Weighing & Mixing Resins & Silicone Rubber The Right Way
• Weighing & Mixing Resi...
3 - Eliminate Entrapped Air in Molds & Castings
• Eliminate Entrapped Ai...
4 - How NOT to Ruin Silicone Rubber When Making Molds
tinyurl.com/32uwjv3z

[@freemanmfg]

This is the 4th in a 12-part series on mold making and casting. See description for more details.